Vibrating screen



A ril 3, 1934 H. B. SLATER VIBRATING SCREEN Filed Feb. 15. 1930INVENTOR.

60/776/ 5 5/076/3 I- B Y TO '1 EV.

Patented A r. 3, 1934 1,953,270

UNITED STATES PATENT OFFICE VIBRATING SCREEN Homer B. Slater, Dormont,Pa., assignor to The Koppers Company of Delaware, a corporation ofDelaware Application February 15, 1930, Serial No. 428,579

6 Claims. (01. 209-348) This invention relates to vibrating screens andThe shaft 7 is provided with an eccentric porin particular to apparatusfor subjecting the tion 9 surrounded by a ring 10 with roller bearingscreen to vibrations of high frequency and low 11 therebetween. Iamplitude. Springs 12 extend between opposite sides of 6 One type ofvibrating screen, as previously the ring 10 and vertical arms 13integralwith the 60 built, comprises a vibrating element attacheddiframe 2. Each arm 13 is provided with a tubular rectly to a portion ofthe screen instead of to recess for the outer end of the correspondingthe supporting frame of the screen; The vibraspring 12 and thecompression of the springs tion of the screen produced a flexing orwhipmay be adjusted by means of screw-threaded 10 ping of the same.Moreover, the amplitude of shafts 14 having hand-wheels 15. The innervibration was not uniform throughout the area ends of the shafts lhavesuitable blocks for enof the screen. gaging the outer ends of thesprings.

In other types of vibrating screens, the entire The amplitude ofvibration of the screen frame weight of the screen and its supportingframe about the pivot pin 3 is limited by stop members 15 were suspendedfrom the vibrator and the driv- 16 which extend outside each arm 13. ingmotor or other source of power was subject- The screen cloth 1 issecured to side plates 1'? ed to the full effects of the vibration. ofthe frame 2 that are pivotally mounted on An object of the presentinvention is to cause the outer ends of the main body portion of the allparts of the screen to vibrate at a substanframe 2 and retained thereonby means of outer 20 tially uniform amplitude without the use of acircular screw threaded clamps 18. The clamps 75 special driving motorand without supporting the '18, when loosened, permit adjustment of theinweight of the screen on the vibrating means. clination of the screencloth 1 and sideplates Further objects are to make it possible to ad-1'7 with the horizontal. An adjustable chain 19 just the degree ofvibration from zero to maxiand the clamps 18 hold the screen at thedesired mum while the screen is in operation and to have angle. 80 animportant component of the vibration at right Adjustable spacers 20 maybe placed on either angles to the direction of travel of the mateside ofthe clamps 18, thereby regulating the rial being screened. distancebetween the two side plates 17 and the In the screen of my invention,the entire weight tension in the wire screen 1. In Fig. 1, the spacersof the screen cloth, its supporting frame and 20 are shown outside theclamps 18, the side the material resting thereon is supported on aplates 17 being relatively close to each other. pivot that isindependent of the vibrating means. In operation, it is only necessaryto adjust the The screen is caused to oscillate transversely compressionof the springs 12 by means of the to the path of travel of the materialwhereby hand wheels 15 in order to regulate the amplitude 35 the maximumaction of the screen is obtained as, and intensity of the vibrations.Such adjustin effect, the path of travel on the screen is ments mayreadily be made while the screen is lengthened. in operation.

In the drawing: Advantages of my invention are that an ordi- Figure 1 isa vertical section on line II of nary driving motor is used and thevibrating ele- 40 Fig. 2; ment is composed of few and simple parts. The

Fig. 2 is a side elevational View partly in crossweight of the screen,the material resting thereon section of the vibrating screen, partsbeing and the supporting framework for the screen is broken away; andnot carried by the vibrating element but by the Fig. 3 is a verticalsectional view of a portion pivot pin.

45 of the vibrating mechanism, parts being broken All parts of thescreen are vibrated through 9 away. approximately the same amplitude andthe direc- The vibrating screen of my invention comprises tion of thevibration is substantially at right screen cloth 1 that is held at itsside edges by angles to the direction of flow of material down a frame 2pivotally supported by a pin 3. The the screen. There are no vibratingareas alter- 5O latter is supported by a rectangular hanger or matingwith quiet nodes as is the case where a extension 4 projectingdownwardly from a supvibrator is directly connected to an otherwiseunporting bracket 5. supported portion of the screen.

The vibrating means comprises a motor 6 The vibration of the screenoccurs in arcs of supported by the bracket 5 and having a shaft circleshaving pivot pin 3 as their center, as 55. 7 extending through bearings8 in the hanger 4. shown by arrows 21 in the drawing. The move- 1 10ments through these arcs deviate just sufiiciently from straighthorizontal motions to provide a maximum separating eifect on materialbeing screened.

I claim as my invention:

1. Separating apparatus comprising a support, a screen frame pivotallymounted thereon, a shaft mounted on said support, an eccentric mountedon said shaft, arms on said frame extending on opposite sides of saideccentric, and compression springs between said arms and said eccentric.

2. In a vibrating apparatus, the combination of a stationary pivotalsupport, a screen frame suspended from and pivotally mounted on saidsupport, means for adjusting the "angle of said frame relative to thehorizontal, means for oscillating said frame on its support, saidoscillating means comprising an eccentric member engaging a portion ofsaid frame above and in vertical alignment with said pivotal support,and independently adjustable spring members one disposed on each side ofsaid oscillating means and between the same and-said frame for varyingthe degree and intensity of oscillatory movement imparted to said frameby said oscillating means.

3.- In a vibrating screen apparatus, the combination of a stationarysupport having a horizontal axis, a screen frame depending from andcentrally mounted for oscillatory movement on said axis, saidframehaving anupstanding portion, means for-adjusting the inclination of saidframe relative to the horizontal, a rotatable vibrating shaft journaledin said support above the axis of said frame, eccentric means on saidshaft cooperating with the upstanding portion of the frame to oscillatethe latter on its axis ,transversely of its longitudinal extent, andadjustable spring means disposed between said eccentric means and saidframe for varying the amount of oscillatory movement imparted to saidscreen frame by said vibrating shaft while the apparatusv is inoperation. 7

4. In a vibrating screen apparatus, the combination of a stationarysupport having a horizontal pivotal axis, a screen frame depending fromand centrally mounted for oscillatory movement on said axis, said framehaving upstanding portions, a rotatable vibrating shaft journaled insaid support above and parallel to the pivotal axis of said frame, aneccentric on said shaft, and resilient means disposed between andengaging 'said eccentric and the upstanding portions of said frame,whereby the rotation of said eccentric imparts an oscillatory movementto said frame on its axis.

5. In a high frequency vibrating and separating apparatus, thecombination of a stationary support having a horizontal stub shaft, ascreen frame mounted about its longitudinal axis on said shaft inbalanced relation thereto, said frame having spaced upstanding portionsone on each side of said stub shaft, and an eccentric shaft disposed invertical alignment with and parallel-to said stub shaft between saidupstanding portions and connected to the latter for imparting highfrequency oscillations to said frame on said stub shaft.

6. In a high frequency vibrating and separating apparatus, incombination: a stationary support having a pivot, a screen frame mountedon said pivot, a rotatable shaft having an eccentric portion forvibrating saidframe on said pivot, a pair of spring members one on eachside of said eccentric portion and between the eccentric portion and theframe for imparting highfrequency vibrations from said shaft to saidframe, and means mounted on said frame and engaging said springs foradjusting the tension of the latter, to vary the degree of vibration ofsaid frame from zero to maximum independently of the rotation of saidshaft and while the apparatus is in operation.

HOMER B. SLATER.

